Telephone or like transmitter.



No. 829,849. PATENTED AUG..28, 1906. H. A. GUTMORE.

TELEPHONE 0R LIKE TRANSMITTER.

APPLICATION FILED SEPT. 28, 1905.

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TELEPHONE OR LIKE TRANSMITTER.

Specification of Letters Patent. Application file d September 28, 1905. Serial No. 280.557.

' Patented Aug. 28, 1906.

To 00% whom it may concern:

Be it known that I, HAHNEMANN ADOL- PHUS CUTMORE, a subject of the King of the United Kingdom of Great Britain and Ireland, and a resident of 115 Queen Victoria street, London, England, have invented new and useful Improvements in or Relating to Telephone or Like Transmitters, of which the following is a specification.

This invention relates'to an improved dey cc to be attached to or connected with the transmitter of a telephone or like apparatus.

By the use of this device a conversation may be carried on in a subdued tone or even in a whisper without the same being overheard in the vicinity of the s eaker, and the sound-waves are so treated efore reaching thetransmitter that the message is received at the distant terminal perfectly clear and audible.

In order that the invention may be clearly understood, I will describe the same with the aid of the accompanyin drawings, in which Figure 1 is a longitu mal sectional view of the improved device. .Fig. 2 is a plan of same. Fig. 3 is a sectional view of a fragment of the device, showing an alternative form of fitting for a telephone-mouthpiece.

Fig. 4 is a view of a fragment of the mouthpiece of the device, showing an alternative orm of vents; and Fig. 5shows, on a reduced scale, the device fitted to the transmitter of portions suitably jointed together.

. The

an ordinary combined telephone hand set.

In carrying out the invention I provide a member orcasing A, which is circular in cross-section and formed preferably in two On one end of the member A is. a spccia lly-constructed mo'uthpiece B, and on the other end is a suitable fitting adapted to engage with the ordinary transmitter of a telephone or like Within the said member A is loits a ex presented toward the mouth iece B. ase of this cone D is smaller t an the diaphragm,'s o that the diaphragm proper is annular in form and may be connected with the cone in any suitable manner.

The interior of the member A from ornear the mouthpiece end or joint of same to the diaphragm is formed at a corresponding inclination to the cone-piece D in order to produce an annular diverging chamber of suitable width, so as to allow the sounds to be distributed over an even surface.

A fin'e wire-gauze or perforated disk E is located'at the mouthpiece end of the member A, and a similar disk'F is located at the opposite end of the said member. The said gauzes or perforated parts C, E, and F are preferably retained in position between the joints in the device, as shown in Fig. 1, al-

though of course they may be retained in any other suitable manner. They have the effect of checking or modulating the sound-vibrations.

In the member or casing A between the fitting for the transmitter and the center gauze or diaphragm C and preferably close to the said diaphragm are formed suitable perforations or vents, such as G. These vents, however, if desired, may be formed in the fitting which engages with the telephone or like mouthpiece or in the parts connected therewith. They are provided to allow for the superexpansion of the sound-waves and disturbed air and prevent the mutilation of the sounds, and thus overcome the excessive vibrations interfering with the normal effects of the ordinary telephone-transmitter diaphragm.

The mouthpiece B of the device-is specially shaped at its edge portion, so as to fitclosely over the mouth of the speaker, so that a conversation may be carried on in a low tone or even in a whisper without the same being overheard in the vicinity of the speaker. In order to provide an outlet for the expanded air and also to allow for free breathing while conversing, I form in the mouthpiece B suitable perforations, slots, apertures, or vent such as H in Figs. 1 and 2, which, if desire may be covered by gauze, wool, fabric, or the like, or I may suitably corrugate pr serrate the edge of the mouthpiece, as in Fig. 4, or form the vents in the same in any'other suitable manner.

. When the device is intended to be used in connection with tele hone-transmitters such as shown by dotted ines in Fig. 1, I prefer to use a fitting for same such as shown in the said figure. This form of fittin is furnished With a tubular socket-piece I, w. 'ch is adapted to fit into the transmitter-mouthpiece J. A rubber ring K, which is suitably mounted around this socket-piece, embraces the rim of the said mouthpiece J and retains the device in position.

IIO

For the class of apparatus as shown in Fig. 5 a socket-piece such as 1 (shown in Fig. 3) may be used. In this form of apparatus Ipreferably extend the mouthpiece L a short distance outwardly and downwardly by means of a bent tube M in order that the device may be in a more convenient position for use.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

' '1. In a telephone or like transmitter the combination of a eonical'eonoidal chamber having a perforated diaphragm at each end thereof, and a perforated diaphragm in the center thereof, the conoidal portion of the said chamber being provided with vents in the periphery thereof, with a cone attached to the central diaphragm disposed concentrically with the conical portion of the chamber, a mouthpiece secured to the conical portion of the chamber adapted to fit closely over the lips of the speaker and provided with vents in the periphery thereof, and means for securing the whole to an ordinary telephone-transmitter as specified and for the purpose stated.

2. In a telephone or like transmitter the conical conoidal cl amber A having a cone D therein the said cone being attached to a perforated diaphragm C and disposed concentrically with the conical portion of the chamher A as spec fied.

Witnesses: V

Rrom). LoNsnALE, Tnos. C. DOBSON. 

